T4 harvest plants boss phase 2 sometimes takes 5+ min to transform

Well, the problem at the title. Sometimes it takes x2 time to kill the boss with 20 mil DPS than full clear the entire map, it's not funny and not ok, especially deli namharim like charging x3, than do deli skills, than charging again etc etc. 0 threat for me, but takes too long to kill just cuz of invulnerability. Can u finally fix it? Like if it takes 30% health immediately phase 2, let him heal to full bar no one care, but not this infinite "nothing happens" phase 1. Thanks.

Bump